Exhaust fans in bathrooms are always visible and many interior designers struggle with it. There is a way to make them invisible and completely disappear when not in use. Designer Michael Samoriz designed the Venti for Umbra Design which appears to be a regular tile on the outside, but is in fact a fan! Simply pop it open when you need it. This Venti uses ceramic tiles, Variant with depth of 10 mm, RGB LED indicator and Air is drawn into the side slot [Source]